Adjustable cylinder reamer



Feb. 19 1924.

E. P. CAMPBELL ADJUSTABLE'CYLINDER REAMER Filed Feb. 20. 1922- INVENTOR. Ernek s'l .P. LL

-ATTOR1VEY.

Patented Feb. 19, 1924.

UNITED srarss ERNEST P. CAMPBELL, 0F STOCKTON, CALIFORNIA.

ADJUSTABLE CYLINDER REAMER.

Application filegi February 20, 1922. Serial No. 537,721.

To a] Z whom it mag concern Be it known that I, ERNEST P. CAMPBELL, a citizen of the United States, residing at Stockton, county of San Joaquin, State, of California, have inventedcertain new and useful Improvements in Adjustable Cylinder Rcamers; and I do declare the following to be a full, clear, and exact description of the same, reference being had to-the accompanying drawings, and to the characters of reference marked thereon, which forma part of this application. V

This invention relates to improvements in tools used in cylinderreboring or finishing operations, the principal object-being to pro vide a device of this character which has a number of cutting edges, enabling the job to be done in a very'short time compared with the ordinary reamers used.-

Another object is to provide means for accurately Y and quickly adjusting, all the cutters simultaneously, and for positively holding them against movement when so adjusted.

I have also provided cutters of such a size that they may be reground a good number of times without replacement, the adjusting mechanism of the device allowing for a considerable extent ofra'dial movement of the cutters. This latter feature allows a single size of the device, and a single set of cutters, beingused in reboring operations varying in diameter up to i inch or more. l r

By reason of the rapid cut-ting qualities of the tool, and the ease and speed with which the cutters may beadjusted to any micrometer dimension, the time of a reboring operation is cut to the minimum, and the labor cost, at present the greatest item of expense in connection with such a job, is correspondingly reduced.

A further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purposes for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views.

Fig. 1 is a side elevation of the reamer.

Fig. 2 is a front end View, with the capplate half removed.

Fig. 3 is a longitudinal section taken on a line 3-3 of Fig. 2. i

Ffg. .4 is a fragmentary sectionv taken on the line 4-4 of Fig. 2.

Referring now more particularly to the characters of reference on theldrawings, the

numeral 1 represents the cutter-holding head of cylindrical form, and provided at one end with anannular flange 2- and at the other end with a central boss 3 tapped to receive thethreaded end of a shank 5 fit the spindle of a milling'machinle, while the shank is removable so, that the base may be screwed directly onto the spindle, if, the machine is equipped, to so receive it.

adapted to a 1 Radiallycut inthe head-and flange to a certain depth from-the flanged or outer end are a plurality of slots 6 in which arev slidably mounted the cutters 7, whose. inner faces slope outwardly from bottom to top, as

shown at 8. These bevel faces, are-all engaged simultaneously by the frusto-conical portion 9 of an adjusting screw 10,. central:- ly threaded into the head and turnable from the outer faces thereof at all times.

Central alinement of the screw is insured without depending on the accuracy of cut of the threads by reason of said screw having a straight portion 10% above the threads, which fits snugly in a-plain bore inthe, head.

The radial movementwhich the cutters may have therefore depends on the angle of slope of the portion 9 of the screw, and the distance which the latter may be, moved axially." The upper edges of the cutters project slightly beyond the surface of the head inside the flange 2, and may thusbe held and pinched against the-bottom of their slots by means ofa plate 11 fitting snugly in the flange 2 and adapted to be firmly pressed onto the cutter-edges by means of a plurality of screws 12. The plate has a central orifice through which the head of the screw 10 projects-,so that the latter maybe turned without removing 'theplate. Since the latter normally presses hard on the cutters, the screws 12 must be retracted slightly to relieve the pressure before the screw 10 can be turned to make adjustments, and once these are made, the screws 12v arc again'cinched up, positively preventing any movement of the cutters.

The plate 11 is positively forced away from contact with the cutter-edges when the screws; 12 are loosed by means of short coil-compression springs 13 positioned in alternate ones of recesses let out in the head 1 concentric with'a-nd spaced away from the screw holes 12 therein.

The screw 10 governs the outward movement of the cutters, and to draw them inwardly, I provide flat coil springs 15 seating in the remaining recesses 14 and whose ends, tending to spread apart and move forward the outer periphery of the head, project into a groove 16 cut in the head 1 concentric therewith and communicating with the recesses 14,:1nd thence into transverse slots 17 cut in the upper edges of the cutters. V g p By reason of the type of spring used, each spring takes .up a minimum of space, and by engaging twocutters, only four such springs I position at will.

use

In order to increase the cutting length of the cutters, these members project to the top of the flanges Qoutwardly of. the plate, and somewhat beyond the outer face ofv the flanges as shown at 18, so that the tool may also be used for end milling if desired.

To aid in making adjustments, radial marks 19 are placed on the plate 11 about the hole through which the head of the screw passes the head having a similarly positioned base-marlnthe distance the marks 11 are'placed apart indicating preferably the amount necessary to turn the screw to give one-thousandths of an inch movement of the cutters.

To remove the cutters for any reason, it is only necessary to remove the plate 11, the work of a few seconds. The plate when in position, covers all interior parts, and if the various members are fitted together in a workmanlike manner, as they should be, there is little if any chance for any chips, dirt and other abrasive matter to get inside and prevent the ready and proper functioning of the parts.

From the foregoing description it will be readily seen that I have produced such a device" as substantially fulfils the objects of the invention, as set forth herein.

Vhile this specification sets forth inv detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims. 7

Having thus described my invention, What I claim as newand'useful and desire to secure by Letters Patent, is

1. A reamer comprising a rotatable head provided with a plurality of radially disposed slots, cutters slidably disposed in the slots, the number of said cutters being even, means for forcing the cutters outwardly, and a spring for-each two sucessive cutters mounted in the head between the cutters and acting on the latter-to move them in wardly. i

2. A reamer comprising a rotatable head having an annular flange projecting beyond its outer end, said end and the flange having 'aplurality of radially cut slots, cutters slidably disposed in the slots, means for forcing the cutters outwardly, the longitudinal"edges of the cutters extending someplate removably seated inside the flange and adapted to be clamped to the head to clamp the cutters against movement, and springs what beyond the end face of the head, a

removably. seated in recesses provided in the head under the plate, each spring acting on two successive cutters to move them in wardly but hotdirectly connected thereto.

3. A reamer comprising a rotatable head provided with a plurality of radially disposed slots, cutters slidably disposed in the slots, the number of'said cutters beingeven, means for forcing the cutters outwardly and a coil spring for each two successive cutters removably mounted in the head between the cutters and acting on the latter to move them inwardly, said cutters having trans verse'slots in which theopposite ends of the springs are removably seated.

V 4t.A cylinder reamer comprising a head adapted to be held and rotated, a plurality of cutters projecting radially therefrom and extending beyond-the face of the head, a plate adapted to rest on said projecting portions, adjustable screws for clamping the plate onto the head in frictional engagement with the cutters, and spring means seated in the head and acting to move the cutters inwardly and to force the plate away from the cutters when the screws are loosened.

5. A reamer comprising a rotatable head having a centrally disposed orifice in its outer end and a plurality of radial slots cut in said end from the orifice'to the outer edge of the head, cutters slidably mounted in the slots,-means in the orificefor moving the cutters outwardly, springs mounted in the outer end of the head and acting on the cutters to move them inwardly, and a plate removably mounted on said outer end of the head and holding both the cutters and the springs against displacement.

In testimony whereof I afiix my signature. 

